Leaving Comments on Other Sites - Birds as Dinosaurs and Fossil Evidence for Evolution
One of my habits when I'm getting ready to write a blog entry is to do a quick Google search to see if anyone's written anything along the same lines, before. If I find something that's very similar to what I was intending on doing, then there's no reason for me to repeat what's already been done. Sometimes I'll change direction on what I was going to write, and sometimes I'll just table the concept entirely.
Well, in the course of googling for the entry, Birds Are Dinosaurs, I came across a blog, Across the Fruited Plain, which had an entry, Are Dinosaurs Alive Today As Birds?: Refuting Archaeopteryx as "Evidence" for Evolution. Reading through the comments, I followed a link to another of his blog entries, Refuting Fossil "Evidence" for Evolution: The Data is NOT in the Strata. Despite it not being a particularly active blog, I caught a case of SIWOTI syndrome and couldn't resist commenting. Unfortunately, those comments are held up in moderation. My guess is because the owner of the blog just isn't very active in maintaining it (he's only posted three new entries so far this year). But, the only cure for SIWOTI syndrome is to see your comments get published somewhere, so I'm putting them here. So, if you just happen to be a regular reader of Across the Fruited Plain, here are some comments relevant to posts on that site.
First, here is my comment to his article, Are Dinosaurs Alive Today As Birds?: Refuting Archaeopteryx as "Evidence" for Evolution.
I tried leaving a comment to this article a couple days ago, but it didn't go through. If it's simply held up in moderation, then I apologize for being redundant.
I have a question for you, but first some background. Ignoring evolution, most people agree that organisms can be grouped into nested hierarchies. For example, there are prokaryotes and eukaryotes, with animals being one group of eukaryote, and then vertebrates as one type of animal, and mammals as one type of vertebrate, etc, etc. So, for example, in the group we call mammals, there are animals as diverse as whales, bats, platypuses, dogs, elephants, people, etc. These are all very different animals, but share common traits that are unique to mammals, so they all get grouped as mammals. Personally, I think that evolution is the best explanation for these nested hierarchies, but maybe that's just the way that a god/gods (depending on your religion) liked to create things.
So, if you look at say, a chicken, a deinonychus, and an ornithischian dinosaur like a stegosaurus, it seems that the chicken and deinonychus have much more in common than either does with the stegosaurus. They're bipedal, have feathers, hollow bones, an air sac respiratory system, etc. And if you pick a bird like archaeopteryx, then it has even more in common with the deinonychus, right down to the sickle claw.
So my question is, ignoring evolution, would you at least classify birds as a type of dinosaur?
Next, here is my comment to his article, Refuting Fossil "Evidence" for Evolution: The Data is NOT in the Strata.
I know this is an old article, but I couldn't help commenting on it. Here are some responses to statements you made, grouped by the headings you used.
Lack of Transitional Forms Disprove Fossil Evidence for Evolution
First of all, why would you expect there to be countless fossils of every evolutionary transition? For example, the modern phylum of platyhelminthes, or flatworms, consists of thousands of species, yet there's scant fossil evidence of these organisms. If living organisms are absent from the fossil record, why would you expect all extinct organisms to be present? Fossilization is a rare event, and it's even rarer still for fossils to be exposed in a location where humans can find them.
How can you claim there are not transitional forms? What about archaeopteryx, tiktaalik roseae, pakicetus, rhodhocetus, dorudon, australopithecus? What would you expect of a transitional form?
Your understanding of punctuated equilibrium is very muddled. You've described what's known as saltationism, which simply couldn't work in sexually reproducing organisms - where would the 'hopeful monster' find a mate? Rather, punctuated equilibrium describes periods of relative stasis punctuated by periods of change rapid on a geological timescale - thousands of years rather than tens or hundreds of thousands. In reality, both punctuated equilibrium and gradualism are detectable in the fossil record.
Ideally, the way dating works is to find layers of igneous rock above and below what you want to date. The igneous rock can be dated very accurately with radioisotopes (I know many young earth creationists don't trust atomic theory when it comes to radiometric dating, but this really is accurate). If no igneous layers are bracketing the sample you want to date, then you can rely on index fossils. These are species that were very abundant but only alive for only a very short time, and so only appear in limited stretches of the geologic column. In fact, these index fossils were recognized before radiometric dating, and used to establish relative ages of different layers. In modern times, there have been enough of these index species dated relative to igneous layers that you can be reasonably certain of the age of a sedimentary layer even if all you can find are the index fossils. But it's only these special index fossils that can be used to date layers, not any of the other fossils you happen to find in them.
Distinct Strata Identification
I'm not really sure what you're getting at, here. I don't know of anybody who would propose a date for a fossil based solely on finding it in limestone. As discussed above, you'd have to have at least index fossils, or ideally, igneous rock above and below the limestone layer you're looking at.
No Fossil is Conclusive Evidence for Evolution
Very true. A single fossil is not evidence. It's the pattern that emerges when you compare multiple fossils. For example, I cited a few examples above of whale evolution. Finding any one of them in isolation wouldn't be terribly strong evidence for evolution. But when you find multiple fossils like indohyus, pakicetus, ambulocetus, kutchicetus, rodhocetus, dorudon, and basilosaurus, it presents a much more cohesive picture.
The Fossil Evidence Supports the Biblical Worldwide Flood
First of all, most animal fossils are not of whole, complete animals. Most are fragmentary, the result of predation and scavenging. And the fossil record doesn't at all match what would be expected from a world wide flood. Organisms are found only in specific strata. Now, I know that some creationists like to explain this with 'hydraulic sorting', or positing that organisms got grouped by their ability to escape rising flood waters, but that doesn't match the reality of the fossil record. And that would still only be an average. Surely, if a worldwide flood had occured, some 'fast' animals would have died for various reasons before reaching higher ground. Yet there are no fossil rabbits in the cambrian, nor are there any ammonites that happened to make it to a higher strata (to pick just two examples). There are too many other problems with a global flood to list here, so I recommend googling "problems with a global flood talk origins" and reading that article.
Update 2015-02-23:My comment was finally approved on that site, and it spawned an entire debate. I also had a few follow-up posts on this site. For a summary of all the posts on this site dealing with this, take a look at Creationist Dishonesty and a Follow Up to Previous Entries.